i have 512 ram, sis661fx. i searched on net about the features of sis661fx and found out that it has pixel shader 2. but when i run death of spies . it says an error graphic card supporting pixel shader 2.0 required. need help plzzzzzzzz

i have 512 ram, sis661fx. i searched on net about the features of sis661fx and found out that it has pixel shader 2. but when i run death of spies . it says an error graphic card supporting pixel shader 2.0 required. need help plzzzzzzzz